Chapter 24 Black Holes “Black Holes are out of sight!” Black Holes Created when core of star is greater than about 5 M Called “black” because gravity is so strong that even light can not escape. The idea of a black hole is a very strange one.
“Black Holes are out of sight!”
According to Newton:
Einstein’s special theory of relativity is based on two basic principles:
Gravitational curvature of spacetime: The massive object resides at the bottom of the gravitational well
The gravitational bending of light: Light bends near a massive object because space near the object is curved and light follows its natural trajectory
The precession of Mercury’s orbit
As the probe reaches the event horizon, it is distorted in to a long, thin shape, and a distant observer sees the color of the probe change as the light from the probe is redshifted.
The probe will appear to take an infinite amount of time to fall in.
The net result is that some energy is taken from the black hole. This decreases the mass of the black hole according to E = mc2. This was predicted by Stephen Hawking and could provide a way of detecting a black hole - Hawking Radiation